Question

Let an be AP for which d=12 and A3 =43 find an

Answer 1

Answer:

d = 12

a3 = 43

=> a + 2d = 43

=> a + (2 × 12) = 43

=> a + 24 = 43

=> a = 43 - 24

=> a = 19

an = a + (n - 1)d

= 19 + (n - 1)12

= 19 + 12n - 12

= 19 - 12 + 12n

= 12n + 7

Ans. 12n + 7

Hope it helps.